The goal of this project is to compare free single-CPU chess engines with large number of games. In this project each participating engine must play at least 30 games match with 16 nearest stronger engines and with 16 nearest weaker engines.
Rating list
Code: Select all
Rank Engine ELO + - Score AvOp Games
1 Rybka 1.0 Beta 64-bit 2946 +17 -16 74.7% -180.6 1492
2 Fruit 2.3 2875 +20 -19 67.2% -121.7 959
3 Glaurung 2.0.1 64-bit 2838 +11 -11 52.3% -16.7 2897
4 Spike 1.2 Turin 2825 +6 -6 46.0% +27.2 11574
5 Naum 2.0 32-bit 2795 +8 -8 48.8% +3.6 5964
6 Bright 0.2c 2786 +15 -15 45.3% +35.0 1677
7 Alaric 707 2761 +11 -11 46.3% +25.3 3136
8 Scorpio 2.0 32-bit 2747 +11 -11 50.5% -2.4 3083
9 Movei 00.8.438(10 10 10) 2731 +15 -15 48.7% +9.5 1713
10 E.T. Chess 13.01.08 2729 +22 -22 51.0% -4.4 695
11 Pro Deo 1.2 2720 +12 -12 42.9% +52.9 2659
12 Frenzee 3.0 64-bit 2713 +14 -14 49.7% +1.9 1764
13 Slow Chess Blitz WV2.1 2712 +8 -8 41.4% +61.9 6337
14 Delfi 5.2 2710 +12 -12 41.6% +60.9 2694
15 Zappa 1.1 64-bit 2709 +15 -15 47.1% +20.7 1632
16 WildCat 7 2701 +9 -9 46.6% +23.2 4503
17 Pharaon 3.5.1 2700 +11 -11 38.8% +81.6 3515
18 List 5.12 2693 +11 -11 48.7% +9.1 3086
19 Colossus 2007c 2683 +15 -15 46.8% +23.2 1568
20 SOS 5.1 2682 +12 -12 46.7% +23.1 2729
21 Ruffian 1.0.5 2677 +12 -12 49.4% +4.3 2478
22 Pseudo 0.7c 2675 +11 -11 50.1% -4.1 3189
23 Booot 4.13.1 2669 +13 -13 51.5% -10.9 1968
24 Aristarch 4.50 2667 +12 -11 45.8% +31.2 2835
25 Hamsters 0.6 2659 +15 -15 51.0% -7.0 1477
26 Petir 4.999999 2657 +15 -15 47.5% +17.0 1476
27 Jonny 2.83 32-bit 2650 +13 -13 46.1% +29.9 2076
28 The Baron 1.8.1 2648 +15 -15 48.8% +8.8 1587
29 Crafty 21.5 PS 64-bit 2643 +14 -14 45.4% +33.5 1711
30 BugChess2 1.5.2 2642 +15 -16 50.2% -2.9 1440
31-32 Anaconda 2.0.1 2639 +13 -13 50.7% -4.2 2125
31-32 Fritz 5.32 2639 +14 -14 52.5% -20.1 1909
33 Smarthink 0.17a 2635 +14 -14 50.7% -5.4 1690
34 Thinker 4.7a 2632 +12 -12 50.6% -7.9 2567
35 Ktulu 4.2 2631 +16 -16 52.5% -18.0 1405
36 Ufim 8.02 2619 +12 -11 51.4% -12.3 2843
37 AnMon 5.60 2613 +13 -13 49.3% +5.9 2084
38 Trace 1.37a 2612 +14 -14 47.7% +17.0 1864
39-40 Little Goliath Evolution 3.12 (TB On) 2610 +16 -16 50.4% -2.6 1343
39-40 Yace 0.99.87 2610 +16 -16 50.8% -6.2 1312
41 Green Light Chess 3.00 2577 +18 -18 47.8% +13.5 1086
42 Tao 5.6 2564 +18 -18 46.1% +26.9 1079
43 Amyan 1.597 2561 +13 -13 46.0% +27.5 2184
44 Abrok 5.0 2559 +17 -17 47.4% +13.7 1180
45 SpiderChess 070603 2556 +14 -14 46.2% +26.6 1936
46 Arasan 10.0 64-bit 2550 +19 -19 45.2% +33.3 957
47 Pepito 1.59 64-bit JA 2546 +21 -21 46.4% +23.0 768
48 Kiwi 0.6d 2518 +17 -17 45.7% +29.7 1259
49 Snitch 1.6.2 32-bit 2516 +19 -19 42.8% +50.4 1034
50 Nejmet 3.07 2514 +16 -16 44.0% +42.4 1477
51 Quark 2.35 2513 +18 -18 42.5% +54.7 1098
52 Dragon 4.6 2503 +16 -16 41.5% +65.6 1454
53 Comet B68 2479 +19 -19 38.3% +83.4 1045
54 Sjeng 12.13 2477 +21 -21 35.9% +100.1 832Recent news
Delfi 5.2 (by Fabio Cavicchio) substituted version 5.1 in the list. It does not look like a noticeable improvement: Comparison. Delfi 5.1 is higher rated at the moment. This is consistent with CCRL 40/40 results. I will still keep testing and listing the 5.2 version. It is currently 14-th strongest free single-CPU engine.
Petir 4.999999 (by Peter Alloysius) substituted version 4.39 in the list. It is rated slightly lower than Petir 4.39 at the moment: Comparison. This is consistent with CCRL 40/40 results to date. I will continue testing and listing the 4.999999 version, which is 26-th strongest free single-CPU engine.
Dragon 4.6 by Bruno Lucas was tested and entered the list as 52-nd strongest free single CPU engine! (Dragon 4.6 results so far)
E.T. Chess 13.01.08 by Eric Triki is currently under testing. (13.01.08 is a confusing way to say 2008-01-13). So far it looks like a great improvement of more than 100 ELO points over E.T. Chess 18.11.05. By the way, this is an update interval of about two years. I personally really like this update schedule. E.T. Chess 13.01.08 is currently 10-th strongest free single-CPU engine.
Future
Many listed engines have updated versions, and many more engines still need testing. These are near the top of my list of engines to test:
- Colossus 2007d
- Crafty 22.0 64-bit 1-CPU
- Frenzee Feb08 64-bit 1-CPU
- Booot 4.14.0
- Thinker 5.1c
- Wildcat 8
- Arasan 10.3
- Alfil 8.1.1
Note 1. Pro Deo 1.2 (latest public version) does not run on machine with 4 GB of RAM, that's why I can't test it and it has many gaps in the table.
Note 2. I am not interested in Strelka, Toga and Sloppy.
Thanks to all authors of original free chess engines! Also thanks to all testers contributing games to the comparison! (Check our "Thanks" page for details)
Best,
Kirill
